function check_form(){
	old_pwd = document.getElementById('old_user_pwd');
	if(old_pwd.value==''){
			return false;
	}
	user_pwd = document.getElementById('user_pwd').value;
	config_user_pwd = document.getElementById('config_user_pwd').value;
	if(user_pwd!=config_user_pwd){
			alert('Not match!');
			return false;
	}
	return true;
}
